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From hack bear <hackingb...@hotmail.com>
Subject RE: mod_perl always segfault on thread creation
Date Wed, 22 Aug 2012 23:16:33 GMT

I'm doing a dynamic build (the default setting I believe.) here are the ldd results (that's
how we can tell, right?)

# ldd /usr/bin/perl
    linux-vdso.so.1 =>  (0x00007ffff2dff000)
    libnsl.so.1 => /lib64/libnsl.so.1 (0x00000039c3c00000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00000039bec00000)
    libm.so.6 => /lib64/libm.so.6 (0x00000039bfc00000)
    libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00000039c1800000)
    libutil.so.1 => /lib64/libutil.so.1 (0x00000039c4000000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00000039bf400000)
    libc.so.6 => /lib64/libc.so.6 (0x00000039bf000000)
    /lib64/ld-linux-x86-64.so.2 (0x00000039be800000)
    libfreebl3.so => /lib64/libfreebl3.so (0x00000039c2c00000)
# ldd /etc/httpd/modules/mod_perl.so 
    linux-vdso.so.1 =>  (0x00007fff33fff000)
    libnsl.so.1 => /lib64/libnsl.so.1 (0x00007fbe6ec80000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007fbe6ea7c000)
    libm.so.6 => /lib64/libm.so.6 (0x00007fbe6e7f7000)
    libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fbe6e5c0000)
    libutil.so.1 => /lib64/libutil.so.1 (0x00007fbe6e3bd000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fbe6e19f000)
    libc.so.6 => /lib64/libc.so.6 (0x00007fbe6de0e000)
    /lib64/ld-linux-x86-64.so.2 (0x00000039be800000)
    libfreebl3.so => /lib64/libfreebl3.so (0x00007fbe6dbac000)


> Date: Wed, 22 Aug 2012 17:11:32 -0600
> From: dhunt@ucar.edu
> To: hackingbear@hotmail.com
> CC: modperl@perl.apache.org
> Subject: RE: mod_perl always segfault on thread creation
> 
> Hi Rommel:  Are you building statically or dynamically?  I had a problem 
> with segfaulting mod_perl, the solution for which eluded me for a long 
> time.  I had been doing a static apache/mod_perl build on CentOS 6.3 
> (similar to RedHat Enterprise 6.3).
> 
> I finally cured the problem by just doing a dynamic build instead.  From 
> what I can tell, static builds in my environment (x86_64, CentOS 6.3, perl 
> 5.16.1) are pretty well broken.  The dynamic build went just fine.
> 
> Just a thought...
> 
> --Doug Hunt
> 
> dhunt@ucar.edu
> Software Engineer
> UCAR - COSMIC, Tel. (303) 497-2611
> 
> On Wed, 22 Aug 2012, hack bear wrote:
> 
> > Thanks but the trick doesn't seem to help.
> > 
> > First the instruction seems wrong. With it, the resulting perl executable does not
even have useithreads defined.
> > 
> > Then I try
> > 
> > CFLAGS='-m64 -mtune=nocona' ./Configure -Dinstallusrbinperl -Dusethreads -Duseithreads
-Dprefix=/usr -des -A ccflags="-fPIC
> > -m64 -mtune=nocona "
> > 
> > Now I get a perl with useithread and -mtune=nocona (versus -mtune=generic)
> > 
> > # perl -V
> > Summary of my perl5 (revision 5 version 16 subversion 1) configuration:
> >   
> >   Platform:
> >     osname=linux, osvers=2.6.32-131.12.1.el6.x86_64, archname=x86_64-linux-thread-multi
> >     uname='linux alcatraz6 2.6.32-131.12.1.el6.x86_64 #1 smp wed sep 21 08:12:51
pdt 2011 x86_64 x86_64 x86_64 gnulinux '
> >     config_args='-Dinstallusrbinperl -Dusethreads -Duseithreads -Dprefix=/usr -des
-A ccflags=-fPIC -m64 -mtune=nocona '
> >     hint=previous, useposix=true, d_sigaction=define
> >     useithreads=define, usemultiplicity=define
> >     useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
> >     use64bitint=define, use64bitall=define, uselongdouble=undef
> >     usemymalloc=n, bincompat5005=undef
> >   Compiler:
> >     cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fPIC -fno-strict-aliasing -pipe
-fstack-protector -I/usr/local/include
> > -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fPIC -m64 -mtune=nocona',
> > 
> > Then I install the perl build, build mod_perl and install. Verify I'm using the
new versions in apache. But still the script
> > produces segfault consistently.
> > 
> > Did people ever get threads to work in mod_perl/apache/redhat enterprise linux 6?
May someone send the "perl -V" output. This
> > basic feature should work out of box on any environment.
> > 
> > 
> > _______________________________________________________________________________________________________________________________
> > From: rsharma51@sapient.com
> > To: hackingbear@hotmail.com; modperl@perl.apache.org
> > Subject: RE: mod_perl always segfault on thread creation
> > Date: Tue, 21 Aug 2012 06:41:09 +0000
> > 
> > Hi,
> > 
> >  
> > 
> > You could try some options for configuring Perl given here:
> > 
> > http://perl.apache.org/docs/2.0/user/install/install.pod.orig
> > 
> >  
> > 
> > specially:
> > 
> > % CFLAGS='-m64 -mtune=nocona' ./Configure -des -A ccflags=-fPIC
> > 
> >  
> > 
> > Before doing a make.
> > 
> >  
> > 
> > Thanks,
> > 
> > Rommel.
> > 
> >  
> > 
> >  
> > 
> > From: hack bear [mailto:hackingbear@hotmail.com]
> > Sent: Tuesday, August 21, 2012 2:06 AM
> > To: modperl@perl.apache.org
> > Subject: mod_perl always segfault on thread creation
> > 
> >  
> > 
> > hi,
> > 
> > This is totally frustrating. My mod_perl script always causes segmentation fault
when it tries to create a thread. I searched
> > the Web and this forum, but there is still no definitive answers. My perl and mod_perl
are of pretty recent versions and I
> > check for the inclusion of useithreads config. I wrote a simple script to prove
it:
> > 
> > use CGI;
> > use threads;
> > use Config;
> > use mod_perl;
> > 
> > our $LOGGER;
> > BEGIN {
> >     $LOGGER = Apache2::ServerUtil->server->log;
> >     $LOGGER->error("testhread starting (CGI version ".CGI->version.")");
> > }
> > 
> > my $q       = CGI->new;
> > my $check = defined $Config{useithreads};
> > $LOGGER->error("useithread? $check");
> > my $v = mod_perl->VERSION;
> > $LOGGER->error("version $v");
> > 
> >     my $thr = threads->create(sub { }); # comment out these two lines will work
> >     $thr->join(); # already crashed at the line above
> > 
> > $q->header(-status => '200 OK');
> > 
> > It produces logs
> > 
> > Aug 20 13:07:50 (4216) [error] testhread starting (CGI version 3.51)
> > Aug 20 13:07:50 (4216) [error] useithread? 1
> > Aug 20 13:07:50 (4216) [error] version 2.000004
> > Aug 20 13:07:51 (4159) [notice] child pid 4216 exit signal Segmentation fault (11)
> > 
> > Any way I can solve this?
> > 
> > Thanks!
> > 
> > (Perl -V)
> > Summary of my perl5 (revision 5 version 10 subversion 1) configuration:
> >   
> >   Platform:
> >     osname=linux, osvers=2.6.18-274.3.1.el5, archname=x86_64-linux-thread-multi
> >     uname='linux hs20-bc2-5.build.redhat.com 2.6.18-274.3.1.el5 #1 smp fri aug 26
18:49:02 edt 2011 x86_64 x86_64 x86_64
> > gnulinux '
> >     config_args='-des -Doptimize=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector
> > --param=ssp-buffer-size=4 -m64 -mtune=generic -DDEBUGGING=-g -Dversion=5.10.1 -Dmyhostname=localhost
-Dperladmin=root@localhost
> > -Dcc=gcc -Dcf_by=Red Hat, Inc. -Dprefix=/usr -Dvendorprefix=/usr -Dsiteprefix=/usr/local
-Dsitelib=/usr/local/share/perl5
> > -Dsitearch=/usr/local/lib64/perl5 -Dprivlib=/usr/share/perl5 -Darchlib=/usr/lib64/perl5
> > -Dvendorlib=/usr/share/perl5/vendor_perl -Dvendorarch=/usr/lib64/perl5/vendor_perl
-Dinc_version_list=5.10.0
> > -Darchname=x86_64-linux-thread-multi -Dlibpth=/usr/local/lib64 /lib64 /usr/lib64
-Duseshrplib -Dusethreads -Duseithreads
> > -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db -Ui_ndbm -Di_gdbm -Di_shadow
-Di_syslog -Dman3ext=3pm -Duseperlio
> > -Dinstallusrbinperl=n -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less -isr -Dd_gethostent_r_proto
-Ud_endhostent_r_proto
> > -Ud_sethostent_r_proto -Ud_endprotoent_r_proto -Ud_setprotoent_r_proto -Ud_endservent_r_proto
-Ud_setservent_r_proto
> > -Dscriptdir=/usr/bin'
> >     hint=recommended, useposix=true, d_sigaction=define
> >     useithreads=define, usemultiplicity=define
> >     useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
> >     use64bitint=define, use64bitall=define, uselongdouble=undef
> >     usemymalloc=n, bincompat5005=undef
> >   Compiler:
> >     cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include
> > -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
> >     optimize='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64
> > -mtune=generic',
> >     cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include'
> >     ccversion='', gccversion='4.4.5 20110214 (Red Hat 4.4.5-6)', gccosandvers=''
> >     intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
> >     d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
> >     ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
> >     alignbytes=8, prototype=define
> >   Linker and Libraries:
> >     ld='gcc', ldflags =' -fstack-protector'
> >     libpth=/usr/local/lib64 /lib64 /usr/lib64
> >     libs=-lresolv -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
> >     perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
> >     libc=, so=so, useshrplib=true, libperl=libperl.so
> >     gnulibc_version='2.12'
> >   Dynamic Linking:
> >     dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib64/perl5/CORE'
> >     cccdlflags='-fPIC', lddlflags='-shared -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector
> > --param=ssp-buffer-size=4 -m64 -mtune=generic'
> > Characteristics of this binary (from libperl):
> >   Compile-time options: MULTIPLICITY PERL_DONT_CREATE_GVSV
> >                         PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP USE_64_BIT_ALL
> >                         USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
> >                         USE_PERLIO USE_REENTRANT_API
> >   Built under linux
> >   Compiled at Oct  4 2011 10:53:24
> >   @INC:
> >     /usr/local/lib64/perl5
> >     /usr/local/share/perl5
> >     /usr/lib64/perl5/vendor_perl
> >     /usr/share/perl5/vendor_perl
> >     /usr/lib64/perl5
> >     /usr/share/perl5
> > 
> > 
> >
 		 	   		  
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